Concordance rate in homosexual gay brothers

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In a study population composed of more than participants, Ellis et al. For other uses, see Concordance disambiguation. Monoamniotic twins share a hormonal environment, but can suffer from the 'twin to twin transfusion syndrome' in which one twin is "relatively stuffed with blood and the other exsanguinated". The following is a scientific investigation of human homosexuality. This result, if true, would prove nearly insurmountable for those people who doubt the biological causation of homosexuality. The perception is that these individuals share the same apartment buildings, offices, clubs, etc. Merely having the gene would not force one to carry out the behavior.
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Born gay? How biology may drive orientation | The Seattle Times

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Title: Homosexual Orientation in Twins: A Report on 61 Pairs and Three Triplet Sets

Most of these early studies suffered from methodological flaws. Alcoholism in Twins , Almqvist and Wiksell, Stockholm. Accessed March 6,
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